Health Care

Semi-identical twins discovered in Queensland

Semi-identical twins discovered in Queensland”

Semi-identical twins are extremely rare-the last reported case was in 2007.

The boy and girl, who are now four, from Brisbane, Australia, are identical on their mother's side but only share a proportion of their father's DNA.

Each sperm cell contains half the father's DNA, but it is not identical from sperm to sperm because each man is a mixture of the genetic material from his parents, and each time a slightly different assortment of that full DNA set gets divided to go into a sperm.

Michael Gabbett, a geneticist at Queensland University of Technology, and one of his co-authors, Nicholas Fisk, an obstetrician and deputy vice-chancellor of research at the University of New South Wales, oversaw the twins' fetal care back in 2014 at the Royal Brisbane and Women's Hospital. There is another type of twin you may have never heard of because of the rarity, they are called semi-identical twins.

Genetic testing revealed that the children were identical, or monozygotic, on their maternal side, but shared 78 percent of their paternal genome, "which makes them genetically in between monozygotic and dizygotic; they are sesquizygotic", the authors write in their paper.

However, they eventually realised that the twins were different sexes - meaning that it would have been impossible for them to be identical.

"It is likely the mother's egg was fertilised simultaneously by two of the father's sperm before dividing", Fisk said in the statement.

In addition, the girl and boy each have male and female sex chromosomes - in other words, each twin has some cells that carry an XX pair (female) and some that carry an XY pair (male).

At first, doctors wrongly assumed the foetuses were identical twins because an ultrasound taken early in the pregnancy showed them sharing the same placenta.

In this case, the embryo reportedly split in two with each ending up with the right number of chromosomes. Her ultrasounds at six weeks indicated she was expecting identical twins, but the 14-week scan "showed the twins were male and female, which is not possible for identical twins", Fisk said.

It is only the world's second known case of semi-identical twins.

This type of twinning occurs when more than one egg is released from the ovary at ovulation (normally just a single egg is selected and released), and both of the eggs are fertilised by different sperm. Researchers from the University of New South Wales and the Queensland University of Technology combed through almost 1,000 cases of twins to confirm their findings.

The discovery was actually made before the twins were born.

They were brought to the attention of doctors because one had "ambiguous" genitalia.

The team analyzed genetic data from 968 fraternal twins as well as from other studies but found no other cases.

Shortly after birth, the girl also developed a clot that cut off blood supply to her arm, which resulted in the limb being amputated. The twins are healthy and have hit all developmental milestones.

Like this



01 March 2019
Respawn's Jedi Fallen Order Will Appear At Star Wars Celebration in April
Star Wars Jedi: Fallen Order was first announced back in 2016 and is produced as part of EA's long-term agreement with Disney. Respawn is now owned by Activision's longtime competitor EA, which recently launched hero-based battle royale Apex Legends .

01 March 2019
Priyanka Chopra and Nick Jonas arrive in India
It is not clear what brings the two to Delhi; it could be her shoot for Shonali Bose's The Sky is Pink or some other work. She called Nick the best travel buddy and mentioned the sheer joy of coming back home.

01 March 2019
Ex-Broncos receiver Demaryius Thomas to be released on personal recognizance bond
Thomas was selected by the Broncos in the first round of the 2010 National Football League draft out of Georgia Tech. Thomas made four Pro Bowls and was part of the Super Bowl 50-winning team at the end of the 2015 season.

01 March 2019
May to seek MPs' approval for new strategy
But he said the European Union had made it "very clear" that the text of the withdrawal agreement will not be reopened. They would complement radio advertisements that are already running.

01 March 2019
North Korea's offer to dismantle nuclear plant declined by Trump
Trump, however, appeared initially eager to accept the kingdom's denials and suggested "rogue killers" might be responsible . They wanted the sanctions lifted in their entirety and we couldn't do that. "It was about the sanctions", Trump said .

01 March 2019
Pakistan to Release Captured Indian Fighter Pilot as 'Peace Gesture'
India's army says Pakistani soldiers are targeting almost two dozen Indian forward points with mortar and gunfire. Just weeks before general elections are due in India, the head of Modi's party in India's Karnataka state, B.S.

01 March 2019
Vatican to open probe into Cardinal Pell over child sex abuse
Mr Gibson said Pell had displayed a "degree of callous indifference" by continuing his attack on the boys despite their protests. Before his appointment to the Secretariat for the Economy in 2014, Cardinal Pell served as the archbishop of Sydney.

28 February 2019
Jonas Brothers reunite for new 'Sucker' single, 'Carpool Karaoke'
What's more, The Jonas Brothers will appear on the Late Late Show with James Corden over four consecutive nights next week. A promo, showing the trio singing the song in a vehicle with James Corden , was posted online on Thursday.

28 February 2019
United States disrupted Russian trolls on day of November election
When it came to the day of the election, Russian agents were taken offline and even complained to administrators that they could not access the internet.

28 February 2019
Witten ends retirement, rejoins Cowboys
Witten was named a Pro Bowler in his last season, 2017, after finishing with 63 receptions for 560 yards and five touchdowns. Recently, Witten made it clear in an interview that he did miss the game and that he actually wanted to play previous year .